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This is a fun example showing how to use BPF to preserve DSCP values across an encapsulating interface, such as Wireguard. It relies on the encapsulation layer preserving the skb->hash value across the encapsulation, which is commonly the case on kernel encapsulation protocols (including Wireguard), and uses a pair of TC BPF programs and a map to re-match the packets after encapsulation and add back the DSCP value. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
9 lines
172 B
Makefile
9 lines
172 B
Makefile
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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USER_TARGETS += preserve-dscp
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BPF_TARGETS += preserve_dscp_kern
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LIB_DIR = ../lib
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include $(LIB_DIR)/common.mk
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